This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. Informal A living creature.

n. Informal A domestic animal, especially a cow, horse, or mule.

n. Informal A person.

n. A creature

n. Any animal.

n. A domestic animal or a non-predatory wild animal; -- contrasted with varmint, also dialectal.

n. A vulgar corruption of creature.

n. a regional term for `creature' (especially for domestic animals)

"Almost always, when a critter is struck there and the bullet does its job, the beast goes down right away or within a few steps."

varmint   

beast    brute    fauna    creature    animate being    animal   

Ritter    Sitter    aglitter    bitter    chitter    embitter    emitter    fitter    fritter    gitter   

critters    cuss    creetur    Gal.    runt    feller